@kjhealy I hope that includes the v3 (?) source code that has my favorite comment of all time: “You are not expected to understand this.”
@ndw @kjhealy I think you may be thinking of the Lyons/Univ of NSW “A Commentary on the Unix Operating System” with annotated v6 source
@staaaaaaave @kjhealy Not in NSW for me, but yes, I think you might be right.